Pantograph-trolley.



P. E. CA$E.

PANTOGRAPH TROLLEY.

APPLICATION FILED 1123.25, 1909.

Patnted July 12, 1910.

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INVENTURZ FR NK E [A515 \/\/iTN 5:15:51 Q aTiI AT T Y.

F. E. CASE.

PANTOGRAPH TROLLEY.

APPLICATION FILED FEB. 25 1909. 963,865 f Patented July 12,1910.

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INVENTEJRL FRANK E. CA5?" Ew ATTY WiTN E551 EEII the undulations of the'tr'olley wire and e 1 fectually preventing an flashing between I said wire and the traveling contact at high speed. Moreover, it will be noticed that the springs -15 tend to urge the trolley upward, so that when released from its collapsed position it will rise automatically until the roller makes contact with the wire.

In other words, these springs perform two functions; that of lifting the trolley and keeping the roller pressed against the wire,

' and that of allowing the roller to have a to and fro movement independent of the main trolley structure. 4

' The means for retracting the trolley comrise a long horizontal cylinder 18 placed engthwise of the car between the transverse shafts 1 1'. In this cylinder are two pistons 19 19 connected respectively to the rock arins 20 20' on the two shafts 1 1. When fluid pr ':sure is admitted between the two pistons they are forced apart'and turn the shafts swinging the arms 3 3 down to the position shown in Fig. 1, and permitting the upper members of the toggle to drop until the joint at the rod 6 passes below the dead center or below the plane of the joints at land 4. Upon releasing the fluid pressure the trolley parts remain locked in this.

osition,'so that no expenditure of energy 1s required to hold them while the trolley remains out of service. I

When it is desiredr'toraise the trolley, a small kicking-off device/is employed, such as the cylinder '21 containing a piston 22 which is connected by the rod 23 with an elbow lever'24, whose long arm lies under the joint of the toggle. Upon admitting fluid pressure .to this cylinder, the lever'is thrown up and kicks up the joint of the trolley. past the dead center, after which the springs 15'15 raise the trolley, as before described. As the roller goes up, the pistons 19 19 approach each other and by compressing the air in the cylinder 18'effect a cushioning of the parts which prevents injurious shock.

I do not desire to restrict myself to the particular form or arrangement of parts herein shown and described, since it is apparent that they may be changed and modified without departing from my invention.

What I claim as new and desire to secure by Letters Patent of the United States, is,-"

1. A pantograph trolley having itstraveling contact capable of vibratory movement independent of the pantographic structure, and a single set of springs operating to raise the trolley and also to maintain the contact yieldingly in a normal position.

2. A pantograph trolley having its traveling contact capable of movement to and fro independent ofthe pantographic structure,

and a single set of springs adapted to raise the trolley'and also maintain said contact yieldingly in'a normal osition.

3. A (pantograph tro ley having pivoted standar s rising from its upper oint, a traveling contact mounted on said standards, springs for raising the trolley, and connections between said springs and said standards.

4. A pantograph trolley having its travel ing contact capable of. movement forward and backward with referenceto the pantographic structure, lifting springs mounted on the lower arms of the pantograph, and.

connections between said springs and said contact.

5.-. A pantogr'aph trolley having its'traveling contact mounted on supports capable of forward and'backward movement with reference to the pantographic structure. lifting springs mounted onthe lower ar; 5 of the pantograph, levers to which said s ring." are connected, and links connecting said levers with the supports of said contact.

6. In a pantograph trolley, the combination with the lower arms thereof, of levers pivoted at the outer ends of said arms, springs attached at'one end to said arms and at the other to the lower ends of said levers, upright standards pivoted at the upper joint of the pantograph, a travelin contact mounted on said standards, an

links connecting said standards with the upper ends of said levers.

.7. In a pantograph trolley, the combination with the upper and lower arms thereof, of levers pivoted to the outer ends of said arms, springs for biasing said levers, a contact member pivoted at the upper joint of the pantograph, connecting links connected to said levers and to said contact member and paralleling the 'upper arms, and means for depressing the upper joint of the pantograph below the plane of the outer. joints thereof.

' 9. In a pantograph trolley, the combination with the upper and lower arms thereof,

' 8. In a pantograph trolley, the combina- 5 to said levers and to said Contact memder graph below the plane of the outer joints thereof, and kick ofi? means for restoring said pantograph to operative position. 10 In Witness whereof, I have hereunto set my hand this 23rd day of February, 1909.

' r FRANK E. CASE.

of levers pivoted to the outer ends of said arms, springs for biasing said levers, a contact member pivoted at the upper joint of the pantograph, connecting links connected iiiI-IRSSQSI MARGARET E. WQQLLEY, HELEN ORFORD.

and paralleling the upper arms, means' for depressing the upper joint of the panto- 

